CVE-2025-53971— Channel and Team Membership APIs inadvertently allow loss of Member privileges.
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I. Basic Information for CVE-2025-53971
Vulnerability Information
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Vulnerability Title
Channel and Team Membership APIs inadvertently allow loss of Member privileges.
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 10.5.8及之前版本的10.5.x版本和9.11.17及之前版本的9.11.x版本存在安全漏洞，该漏洞源于未正确验证团队方案角色修改的授权，可能导致团队管理员将团队成员降级为访客。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 10.5.0 ~ 10.5.8 | - |
II. Public POCs for CVE-2025-53971
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-08-21 · 9 CVEs total
| CVE-2025-49222 | 6.8 MEDIUM | Mattermost Shared Channel Upload Type Validation Bypass |
| CVE-2025-8023 | 6.8 MEDIUM | Path Traversal in Template Upload Allows Uploading Files Outside Target Directory |
| CVE-2025-36530 | 6.8 MEDIUM | Import Path Traversal Enables Unauthorized Unsigned Plugin Installation |
| CVE-2025-8402 | 4.9 MEDIUM | Nil pointer dereference in bulk import crashes server |
| CVE-2025-6465 | 4.3 MEDIUM | Path traversal in image upload with preview overwrite |
| CVE-2025-47870 | 4.3 MEDIUM | Team invite ID leaked to team admin with no member invite privileges |
| CVE-2025-47700 | 3.5 LOW | AI plugin APIs can be triggered using post actions |
| CVE-2025-49810 | 3.5 LOW | Thread summarization allows persistent access to channel |
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
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- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-863
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